MTHFR and colorectal carcinoma: To compare the genotypes of Taiwanese CRC patients with those of other races (Table 3), this study compared the distribution of gene polymorphisms, such as GSTP1 313A>G (AA, AG, GG), ABCB1 3435C>T (CC, CT, TT), MTHFR 677C>T (CC, CT, TT), TYMS tandem repeat (3R3R, 2R3R, 2R2R), ERCC2 2251A>C (AA, AC, CC) and XRCC1 1196G>A (GG, GA, AA), in various races, races – Caucasian, Japanese, Korean, Chinese, and Taiwanese.